update.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 48 行

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2006, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |                                         **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id:Update.scala 6853 2006-03-20 16:58:47 +0100 (Mon, 20 Mar 2006) dubochet $


package scala.dbc.statement;


import scala.dbc.statement.expression._;

/** An update of the state of a table. */
case class Update (
  updateTarget: String,
  setClauses: List[SetClause],
  whereClause: Option[Expression]
) extends Status {
  

  /** A SQL-99 compliant string representation of the select statement. */
  def sqlString: String = (
    "UPDATE " +
    updateTarget +
    " SET " + setClauses.map(sc=>sc.sqlString).mkString("",", ","") +
    (whereClause match {
      case None => ""
      case Some(expr) => " WHERE " + expr.sqlString
    })
  );
  
  /** The name of the table that should be updated. */
  //def updateTarget: String;
  
  /** The data that will be added tot he table. */
  //def setClauses: List[SetClause];
  
  /** Defines condition that must be true in the tuples that will be updated.
    * This value expression must return a boolean or boolean-compatible
    * value. */
  //def whereClause: Option[scala.dbc.statement.expression.Expression];
  
}